Re: GPT header checksum mismatch

On Tue, Mar 29, 2022 at 11:47 AM Arthur Chance <freebsd@qeng-ho.org> wrote:
> On 29/03/2022 15:45, Greg Balfour wrote:
> > Running 12.3-RELEASE I had a UPS failure and my machine did a reboot
> > without properly shutting down.  Now when it boots I see this
> > message:
> >
> > gptboot: backup GPT header checksum mismatch
> >
> > Doing a "gpart show ada0" shows
> >
> > 34  976773101  ada0  GPT  (466G) [CORRUPT]
> >
> > The machine still boots fine.  I don't have a prior dump of the
> > partition table saved.  How can I clean up these errors?
> >
>
> Try gpart recover.

So I did a recover and it appeared to work...

# gpart recover ada0
ada0 recovered

And a gpart status on ada0 was no longer showing as corrupted.  But after
rebooting I still get the header checksum mismatch error and a gpart
status on ada0 will show again as corrupted.  Also seen on boot:

Mar 30 08:21:01 desktop kernel: GEOM: ada0: the secondary GPT table is
corrupt or invalid.
Mar 30 08:21:01 desktop kernel: GEOM: ada0: using the primary only --
recovery suggested.

This is repeatable.  A gpart recover appears to work but on reboot
everything shows as corrupted again.